# Thread: Giant 20' x 3' x 2' router build

1. I think some how I had done something wrong the first time around trying to set it up so tried again. setting the micro step to 1600 and the amps to 4.2 and doing the auto tune.

am I right in thinking if I have a 2.5:1 and 1600 ms the steps per should be at 640?

2. oops ok realized I have gone wrong again im getting my steps per rev and micro steps mixed up. can any one clarify the difference?

3. Steps per is how many steps required to move 1 unit. So if your working in MM then how many steps to move 1mm.

Micro steps is how many micro steps to turn 1 revolution of the screw.

So the calcution for STEPS PER MM is first Divide screw pitch by ratio then divide Micro steps by calculated Pitch. IE 5 / 2.5=2 so 1600/2=800 Steps per MM
Last edited by JAZZCNC; 01-01-2015 at 08:23 PM. Reason: Doh I got it wrong as well. . .Lol

4. ok so is the 1600 we were setting using the switches witch on the side of the driver refers to as step/rev is the same as in pro tune when you set the micro step?

many thanks

5. Originally Posted by charlieuk
ok so is the 1600 we were setting using the switches witch on the side of the driver refers to as step/rev is the same as in pro tune when you set the micro step?

many thanks
Ok I think I see your confussion Charlie.? There's 2 ways to describe the same thing.!
Some will say 4X 8X 16X etc which is technicly more accurate and this relates to the amount of degree's the stepper motor gives per revolution multiplied by the number.
Other way just assumes typical 200 steps per rev and gives total micro steps per rev.

IE typical stepper uses 1.8 degree or 360/1.8=200 steps per revolution. So 4 x 200 = 800 micro steps per revolution
If you used 1.2 degree steppers then it would be 360/1.2=300 so 4 x 300=1200 MicroSteps Per Rev

The Drives show typical 200 steps per rev on the front but the protune uses the more correct multiplication factor. so if you want 1600 micro steps you'd use 8 in protune.
Last edited by JAZZCNC; 02-01-2015 at 12:48 AM.

6. I Yes much confusion but it makes sence now, was wondering why when I put 1600 in pro tune it went rather slow! Super smooth though lol many thanks

7. Originally Posted by charlieuk
I Yes much confusion but it makes sence now, was wondering why when I put 1600 in pro tune it went rather slow! Super smooth though lol many thanks
Yes 320,000 micro steps per revolution does tend to have that affect . . LOL

8. Hi all hope every one is doing well, its been a while since I have been on here mainly due to the fact the cnc has made me super busy with what I made it for ( cutting stand up paddle boards)

Any way last week I made my biggest mistake and killed my super expensive router bit by hitting something and bending it a fraction, I nearly cried!

I have a new bit now although of a different type and this one requires spinning the opposite direction. Tbh I have kinda forgotten a lot about how I built it and set it up but just wondering if any one could prompt me with the best way I would go about changing from ccw to cw rotation on the china 2.2kw spindle/vfd.

any for those that are interested this is what I have been cutting the last year.

Many thanks

Attachment 17255
Last edited by charlieuk; 22-09-2017 at 10:10 AM.

9. If you don't want to change any software or vfd settings then just swapping any two of the three wires over going to the spindle will reverse it.

10. Charlie do you control on/off thru software.? If so then just swap wire going to "For" to "Rev".

Or if you want both forward and reverse options then setup another wire coming from Spindle control relay to the "Rev" and use M4 in your G-code.
Last edited by JAZZCNC; 15-01-2016 at 07:27 PM.

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